package com.example.animationdemo;

import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.Log;
import android.view.animation.Animation;
import android.view.animation.Transformation;

/**
 * Created by tangjiangxu on 11/14/17.
 */

public class Rotate3dAnimation extends Animation{
    private static final String TAG = "Rotate3dAnimation";
    
    private float mFromDegrees;
    private float mToDegrees;
    private float mCenterX;
    private float mCenterY;
    private float mDepthz;
    private boolean mReverse;
    private Camera mCamera;

    public Rotate3dAnimation(float fromDegrees, float toDegrees, float centerX, float centerY, float depthZ, boolean reverse) {
        mFromDegrees = fromDegrees;
        mToDegrees = toDegrees;
        mCenterX = centerX;
        mCenterY = centerY;
        mDepthz = depthZ;
        mReverse = reverse;
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        super.initialize(width, height, parentWidth, parentHeight);
        mCamera = new Camera();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        Log.e(TAG, "applyTransformation: ");
        super.applyTransformation(interpolatedTime, t);
        final float fromDegrees = mFromDegrees;
        float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
        final float centerX = mCenterX;
        final float centerY = mCenterY;
        final Camera camera = mCamera;

        final Matrix matrix = t.getMatrix();
        camera.save();
        if (mReverse) {
            camera.translate(0.0f, 0.0f, mDepthz * interpolatedTime);
        } else {
            camera.translate(0.0f, 0.0f, mDepthz * (1.0f - interpolatedTime));
        }
        camera.rotateY(degrees);
        camera.getMatrix(matrix);
        camera.restore();

        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}
